I think the main problem with the first 3 attacks were the stiffness, some areas could require some in between frames to make it smoother and help with the deceleration.
But the main thing that I disliked about the animation was the final "Upper Kick", the kick happened almost out of nowhere, the movements from the side kick to the upper kick were extremely fast and were hard for me to grasp exactly what you were going for with the transition from side to upper kick. However, I find it hard to understand how the upper kick could be effective if their was an opponent beside him. The side kick would have knocked him far enough away (judging by the length his leg is stretched doing so) that his opponent would not have been anywhere close to him when the upper kick was performed for it to cause any actual effect.
Also damn, he's gotta have some flexible legs to reach that far.
Anyway, the first 2 hits were decent, the 2 kicks following could have been a lot more fluid, less nonsensical and the whole thing could have been a lot less stiff. Good luck with future practice, hope this helped :)